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Measurement of Spatial Stability in Precision Grip
09:36

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Published on: June 4, 2020

Effect of object width on precision grip force and finger posture.

M Domalain1, L Vigouroux, F Danion

  • 1Institute of Movement Science UMR 6233, University of the Mediterranean, CNRS, Marseille, France.

Ergonomics
|September 20, 2008
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Summary

Object width significantly affects how people grasp objects. Grip force increases with object width, suggesting a strategy to maintain a consistent grip force relative to maximum capacity for better object manipulation.

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Area of Science:

  • Biomechanics
  • Human Factors
  • Motor Control

Background:

  • Understanding spontaneous grasp is crucial for designing tools and assistive devices.
  • Previous research has explored mass and size effects, but object width's specific impact on grip force and posture requires further definition.

Purpose of the Study:

  • To investigate the influence of object width on the spontaneous grasp.
  • To analyze changes in grip force, maximal grip force, and finger postures in relation to varying object widths.

Main Methods:

  • Participants grasped objects of diverse masses (0.75–2.25 kg) and widths (3.5–9.5 cm).
  • Grip force and maximal grip force were measured using embedded force sensors.
  • Finger postures were recorded using an optoelectronic system.

Main Results:

  • Index finger joint postures adapted to object width, while thumb posture remained consistent.
  • Grip force escalated with increasing object width for a constant object mass.
  • Maximal grip force also increased with object width, indicating a potential constant ratio strategy.

Conclusions:

  • Grasp adjustments are width-dependent, with the index finger playing a key role in accommodation.
  • A constant ratio between grip force and maximal grip force may be employed.
  • Optimal object width for manipulation differs from that required for maximal force exertion.